Could They Be Real Silver?

Ask for your money back immediately. These are not worth 5 dollars any time any day.

These are often struck in cheap base metals and who knows what heavy metals are in them.

I'll bet none are silver.
They look like many fakes I have in my collection.
The slide test is not foolproof.
It's only one test among many.
By itself alone, it means little or nothing.
Somebody made money off you.
I paid about $1.00 or less for each just to have them and document the details with photos in my collection.
When you say "grabbed them". That spells greed to me and you have been duped.

To the Forum.

I know the tissue test.
Genuine silver reflects white or bright under the tissue.
Not sure about the results when a coin is toned or tarnished.
It's likely none of these coins would pass the Ice Test.
I have doubts about the OP saying they pass the Coin Slide Test.
Suggests to me the OP doesn't have the right slide or knows how to use it.
On the other hand, it's possible the alloy could contain enough metal to mimic the drag on the coin.
Copper would do that.
If I had these in my shop, just to satisfy the owner, I'd check SG.
And from that, there would be no doubt if any are silver or not.
Usually these fakes are anywhere from 10 to 20% under weight.
They will normally NOT be Diamagnetic.
A quick look under the scope, with weights & measures would probably tell the OP of the blunder.

Speaking of greed I have a story.
In one case I paid over $100 for a Chinese coin because I didn't think the seller really knew what he had.
This seller is reliable, honest and has a good reputation.
He simply maybe didn't know the coin and I bought it.
It was fake.
In another case a different seller showed me two Chinese coins and offered to give them to me as freebies.
I told the seller they looked genuine to me and I'd buy them.
The seller didn't know Chinese coins and didn't care about them.
I argued they were worth good money, but he refused payment.
I finally talked him into taking at least $1.00 each for the two coins.
The two coins proved to be genuine worth about $110.00 each at the time.
So my greed in one case was a learning experience, offset by my good fortune in another.

These are all found and documented in my collection.
I might take the time to enhance the pictures and report back later.
Or maybe just some selected coins.

I might see another quick blunder.
The OP should post one coin at a time with good focus.
A lower right piece looks like Shansi Province under Kuang Hsu.
Shansi did not mint any silver coins during Kuang Hsu.
So an obvious fake near the start and near the end suggests none are genuine.
They are still nice conversation pieces. The OP just paid 5X too much for them.
There's always a chance one may be genuine, but I doubt it.

Odds are the OP will not have a known genuine to compare.
Some coins will "ping" giving the OP false info.
One coin I have will ping, but the difference is that the duration is shorter compared to a genuine.