Funny you should mention "low notes", because after years of swapping notes out, I found my first yesterday. AMG0000811 in EF condition. Also, i got a really nice run of INUs today, but unfortunately no radars, repeaters, or special serial numbers. Now that I know this branch is issuing new INUs I will go back each day for a bit to see if I can score a nice note. But, to be clear, I do not withdraw any money from a bank account -- therefore no fees. I simply do a "Cash In - Cash Out" transaction. This means I walk into the branch with $1500 or $2K in five dollar notes (for example) and ask the teller to simply "swap them out" for different five dollar notes, without the transaction being recorded on my bank account. No deposits/withdrawals = no fees. If you are dealing with a branch that has only ONE cash dispenser, you need to ask the teller to WITHDRAW the new notes first, before depositing your old notes into the machine, as the machines load from the top, and you will get your old notes back if they deposit your old cash first. If you drive -- ditch your car and use the subway to go from branch to branch as there is one at almost every subway stop and it's quick and easy and you don't need to find parking.
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If you are going from branch to branch, you need somewhere to 'check your notes on the go'. Personally, I stay in the bank and pull up a little table next to a chair and will go through my notes INSIDE THE BRANCH as it is the safest place to do it. Then -- off to the next branch.
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I have done transactions like this for years up to $5k sometimes. The only time a branch has an issue is if they are short on the denomination I am looking for, but the issue is moot if I am giving them $5k of the same denomination to swap out. But the key to finding notes in circulation is to find the notes in the best condition. Therefore, it is good to hunt the newest issues coming out. If you happen to find a run of new issue turn-over notes like the first issue of the $20 Lane signature notes, it's an nice idea to hang on to the ones in the best condition. P.S You can access the SNDB on your phone while your are in the bank checking notes.