Proof Coins "In The Wild"

So if the background is black it's a proof? I guess I've had lots then, seen that lots of times, though not such nice details on the Washington head. I notice a lot of you are referring to half dollars. -I can't recall the last time I ever got one in change. I asked my bank recently if they had any and the lady said no. None, really? So how can I get them?

Ha, dare I even ask how much a BOX of half-dollars is? Is it possible to just order a couple rolls? I can't imagine having whatever amount of spare money available to order a whole box. I know, I could still spend the non-collectible ones, but something tells me my bank would not appreciate me ordering a box of an oddball currency, only to bring back most of them a day or two later, after I've sorted them.

I work at a bank and I dont mind buying them but I tell them they cant use us to dump them back and that they need to buy the rest of them at some point.

We use brinks and I am sure it does cost to ship it in and out but we really dont see that on our side. Its more of like paying for a service. Same cost whenever I buy coin or not.

Thanks so much for the answers!

I got 5 proofs out of my last nickel box

I'm still not sure I'd know one if I saw it, particularly because I've been getting my hands on lots of coins of all denominations and studying them closely the past couple months (not long by hobbyist standards, but of the thousands of coins I have looked at, wouldn't I likely have come across at least ONE?).
So about this "reflective" surface. --I certainly have had some extremely shiny coins, I don't know if they'd reflect images but they certainly reflect light brilliantly, but usually they've been very 'young,' and presumably circulated gently (or just not much). Revisiting my initial post, the part about whether a worn proof would look like a business strike, let's get more specific: Say we're talking a 1988 Lincoln Cent proof, circulated heavily. No matter what it had been through in the past 30 years, would you still be able to tell it from one of these dazzling 20-teens Lincoln shields? (never mind their seemingly universal water spotting).
If there IS something about proofs that distinguish them even after decades of torture--WHAT IS IT ABOUT HOW THEY'RE MADE? Are they made of different metal than their contemporary business strikes? Are they laminated in something really shiny and tough? Do they weigh the same?

Yeah I do suspect you're right about that. And I'll probably be going to my local shop sometime this week, so I'll be sure to look in the "glitter" displays, which I usually ignore. But what about what I asked about how proofs are made? EDIT: OOOO! I have the right question to ask now. Okay, so if proofs don't have anything that provides irrefutable evidence (like a mint mark or differing weight or whatever), how could you tell from a photo if a coin is really a proof or just a really shiny coin and the person is either lying or mistaken about it?