You may have heard about how I got the wrong Arduinos in the mail... I wanna test one out, but only if they will still take it back... Can they tell of I used it? As in if I upload the blink sketch or something?

Telling If An Arduino Has Been Used?

Topic		Replies	Views
Brand new Uno - can't upload anything to it IDE 1.x	30	12156	May 5, 2021
defect boards! sending back? Troubleshooting	7	2535	May 6, 2021
Spontaneous un-programming of Arduino USB board Frequently-Asked Questions	21	5292	May 6, 2021
Brand new Arduino Uno won't upload and led on 13 blinks 4 times a second 3rd Party Boards	21	10003	May 6, 2021
Have I blown a board, or just a bootloader? Troubleshooting	5	1338	May 6, 2021