Instead of searching through 1000 notes, in a brick, why not start out with bundles . What I do, on occasion, is I will ask my teller for just regular bundles of 100 notes. 100 5.00's is 500.00 and 100 10.00's costs 1000.00 which is usually the amount I get. I have been fortunate to find a few Radars and 1 or 2 inserts, however the best condition is always VF to EF . This method raises no alarms or flags and they always oblige my request as it takes very little time. Try it and let us know if you find any keepers.
Keywords: you are doing research (which is true), and you contribute it to a hobbyist site, and you report to people who are names in ink, in the catalogue.
So... If you get a brick, search for stuff, and the post your finds here, then you are validating each of those claims. :-)
Always ask what the easiest way to do it would be - followed by can I just flip cash for cash? - "Like, I can come in with these ten $100s, and then look at these here right in front of you -, then give them back, and it is done. " <- always carry some extra notes, so when you slide out the palindrome (and let them know you are taking one out), you need to slide a ratty note in its place.
Just be honest with them. Direct them to this enthusiast site here (this site) if you need.
Your passion should make them want to help. :-)
Note: if possible, dont let them do a deposit withdrawal at every flip. Cash for cash, OTC, and always you leave with the stock you came with (plus picked notes).
Lots of ways. Just get them to know you and what you are doing.