Paypal Temporary Hold - Transaction With Higher Risk

10 days is much shorter than average. Usually 20-30 otherwise.

I would send the buyer the Paypal requirements, and reason for holding shipment, some time transaction of this kind takes longer than usual.

As long as the payment is cleared by Paypal, I would not worry, take video of shipping the package for proof.

Because of COVID, there is no signature option.

This is the reply I just got from Paypal (unfortunately, they only talks about holding of the funds

Welcome to PayPal messaging! My name is *** and I will be more than happy to assist you. Hi ****, I understand that you wish to verify your funds, don't worry I will exhaust all my resources to help you out today.
Your funds will be released 1 day after we confirm that your item was delivered.
If you do not complete the above steps, your money will be available 21 days after the purchase was completed.
Upon reviewing your account, I see that the below transaction ID is placed on 21 days hold. This is because the buyer has not confirmed the receipt as the buyer has to provide the confirmation. Since we need to ensure orders are fulfilled correctly and your buyers are satisfied with your goods/services.
We do not have an option to release the funds before the item got delivered. The purpose of holding the payment is to ensure that your buyer has received the item in the promised condition. Hence, without confirming the delivery, system won't allow us to release the funds.
Do not worry I shall provide you two options to get the funds released before 21 days
Please find the 2 options provided below:
1. If you have sold a service or a product and the item is delivered, here's how to add your tracking information or change the order status: #12288;
1. Log in to your PayPal account.
2. Click Activity at the top of the page.
3. Click Add Tracking next to the transaction you'd like to update.
4. If you sold an intangible item or service, select Order Processed in the box labeled "Order Status" instead of Add Tracking.
5. Fill in the applicable information.
6. Click Submit.
2. The buyer would be notified via email once the above steps are completed and the buyer needs to complete the below steps to confirm that they have received an item or service. Please send the steps below to your buyer so that they can follow it to release the funds for you:
1. Log in to your PayPal account.
2. Click Activity.
3. Find and click the original payment for the item.
4. Click Confirm Receipt.
5. Click Yes to confirm that you received the order.
The above provided are the two option which you can follow to make your funds released; else the funds will be released 21 days from the payment date.
We need a tracking number that shows item delivery. In this case, please contact your buyer and ask him to confirm receiving the item. Once the buyer confirms on his side, funds will be released immediately on your account that is on 1/21/21.
Please be informed that the payment hold will be released on 3 occasions:
1. If the buyer clicks on confirm receipt on their PayPal account after receiving the product (will be released immediately).
2. If the item shows that it is delivered to the buyer through the tracking details that you provide us after shipping the product (24 hours after the item being delivered).
3. After 21 days without any action from you or the buyer (which is the automatic release).
If ever the buyer can't confirm the receipt, the money will be on hold for 21 days maximum and after that the system will automatically release your money and can be withdraw/transfer to your bank.
Once the funds are released to your balance you shall be notified via email and once the payment has been released please do not attempt a withdrawal right away as it could go for an extended review period. Please kindly wait till the end of the day or the next day to withdraw once the payment has been released.
To withdraw money:
1. Click Transfer Money below your PayPal balance.
2. Select Money out.
3. Choose how you would like to withdraw the money under the "Instant" or "Standard" section, and click Next.
4. Fill in the amount you are transferring and click Next.
5. Review the details of your transfer, then click Transfer Amount Now.
6. Click Done.
The money will be deposited within 30 minutes for Instant transfers or within up to 72 hours for Standard transfers.
Withdrawals to a bank account typically complete in 1 business day but it may take up to 5 business days to show in your bank account depending on your bank's clearing process.
Feel free to reply whenever you're ready and we'll reply as soon as we can.

I had a sale that had a hold recently. Coin was shipped to Denmark without tracking and PayPal released the funds before the buyer even got it. No clue how they decide when to hold funds. I'm a new seller but it wasn't on my first dozen or so sales and not a new buyer.