TOFO, quite, signed a form when I joined, when I left, when I rejoined and probably in between. Somewhere I have a copy of the first.
When I finally departed they sent me yet another OSA form amongst others. I filled out my pension request, bank details etc and binned the rest. No one checked.
Now it would be a good SAR to ask for a copy of each form I signed
. If they can't find it then there would have been no point whatever.