I personally work for walgreens as a manager and to my knowledge all of the registers are set up for special reciepts. Whomever, this supposed district manager was probably hasn't worked for the company for a long time (as I've worked there for 5 years working the ranks and the turn over is extremely high) or they never worked the registers (which doesn't surprise me because they like to promote friends and relatives there not quality). The reason for the special reciept key is exactly for the rebate purposes and also for gift returns, thus they are on all of the registers.

However, this being said...not all registers are set up the same. In my store alone there are two different style keyboards and on top of that not all are labeled (some have lost the labels and if they're new they might not have been labeled yet). Your best bet is to get to know your local walgreens/cvs/retailer staff, because the more they know you as a "good" customer the more they are willing to train their staff, label the keys, and finding out how to do the special reciept for you. We actually have a store net site to help us which helps us troubleshoot.

P.S. The special reciept key is usually red as thats the sticker they like to print it on for us.

P.S.S. Please remember everyone has bad days and that we all can gain more with a smile, kindness and patience...to sneer at the manager/cashier and tell them to look up the instructions on how to do it will cause everyone disappointment because 9 times out of ten they won't.