Tip Teller Mean More Coins? Smart Phone App 2 Weigh Coins?

Hi,

I recently found a 1972 s penny in a box of pennies and was able to complete a lincoln memorial set and was woundering if it would be a good idea to tip the teller that gave me the box. I go in there a lot and get boxes from them. I would imagine if I gave a tip to a teller that I would be able to go in there when ever I wanted to get coins.

Anyone have any experience with tipping tellers when you find rare coins. What has been the results as far as continuing to withdraw more coins from the bank?

I work at a gas station and this guy would always come in on my shift and play 777 and would play a dollar a ticket and buy 200 dollars on that one number several times a week. One time he won and came in and gave me 50 dollars. Apparently he made like 20,000 when he won and now when he comes in I'm always ready to help him with a big smile on my face. He said that in Casinos you always tip the dealer when you win and it's sort of like a tradition or something.

Anyone have any experience or stories about tipping tellers when they give you a rare coin in a box of coins?

Also can anyone recommend a app for a smart phone that's a scale so I can weigh my 1982 pennies. I want to put them in my folder so that way it's complete but can't because I don't know which ones are copper and which are zinc and don't really feel like purchasing a scale and don't know were I could even get one and feel as if there has to be some other way to do it thanks.