Completely agree. Wholesalers do routinely check batches of papers where either they have been instructed to carry out random checks, or where there is a financial gain to be had from stores removing coupons and using them improperly (for example in order to gain a free product with the voucher or to obtain credit back for something which they haven't actually 'sold' to a customer). In the latter cases, I have known retailers to be either re-charged, refused credit, or, rarely, to actually be prosecuted for fraud, so it is important to know whether this incident was instigated by the wholesaler catching the retailer out, or the employer acting independently of any wholesaler investigation. I have also known wholesaler members of staff to be summarily dismissed for doing exactly this. In Post #1 I would be very concerned at the suggestion that it is considered OK to remove 'Free Bottle of Pop' coupons and to pass them to others to commit an act of fraud, and where there is a real monetary value attached to the redemption of the coupon.
Copies of papers and magazines in the staff room should also always be paid for first - never mind that there may not have been enough supplements with the papers - that usually happens where there is a late-breaking story and extra papers are printed but it is too late to print additional magazines to go with them. The papers are still charged as 'stock' to the store and are supposed to be displayed beneath those that do have supplements so that the publisher benefits from the added interest in the front-cover story - it is normally against the rules to have any stock items kept in staff areas which are then returned for credit.
Whilst your previous FWW may now have been expunged, I would be concerned at how you keep falling into acts of dishonesty (albeit at the relatively minor end of the scale) and why you didn't learn to be squeaky clean after the last incident. If you are going to stand any chance of redeeming this, you are going to have to explain what, and who, led you to believe that this practice was acceptable. You will stand a better chance if the investigation was on the employer's part rather than being generated by any wholesaler refusal of credit.