A few years back, I grabbed a string of credit unions from one of the franchising operations. Picked up the keys, branch by branch, that the franchisor's individual franchisees had dropped off earlier in the day. Looking at the keys to a couple of the branches, I found little sticky tags on the keys - the building address on one side, the alarm code on the other. Quite convenient.
Sometimes training and supervision of janitorial franchisees leaves a bit to be desired.
In 38 years in business, I believe we've never put a client name or address on building keys. Never even thought to put an alarm code on a key. We're also careful to store client paperwork, containing name, address and alarm code, seperately from the building keys. The only thing that we put on the keys is an internal client account number; one would need the client paperwork to tie the key to a client, address or alarm code. So, if we drop the keys in the Circle K parking lot, we have a problem - but not as big a problem as we'd have with the client's information attached.
Back to the credit union keys. Made a big mistake. When I got back to my office, I pulled the sticky tags off the keys, before duplicating them onto "do not dupe" (neutered bow) blanks. I should have photocopied the sets of keys, with address and alarm code, framed it, and put it on the wall of our training room - next to the motivational two-by-four.
Live and learn.