Hope you find who it was.
Pathetic that they did not own up.
When I stored my caravan, the owner had a policy where only he or his staff moved vans in and out of the storage area. A phone call the day before would see the caravan sitting in the "pick-up / drop-off" area.
He had the spare hitch lock and wheel lock key so the caravan was never left insecure. On my return, I would lock it up in the "area" and leave. He would then move it back into storage.
He said it was easier than have someone damage a caravan, boat, motorhome etc etc.
His insurance covered ALL movements in the storage area, so that's why he or a staff member did it.
Hope you get it sorted.......