Are we going to find out what the o/p done then ?
If he has been daft enough to pay £20+ a night on an msa of all places, for up to 5 nights, and, without getting it back, that equates to a day working for nothing 
If it was me I would feel ■■■■■■ off and totally cheated, so go all out to get it back.
If I still failed to get it back, then I’d think of something myself, or take some of the advice from the guys off here, and either park in the dodgiest place I could find, and/or lose the keys.
The question is,…Is the o/post going to be just another enquiry only, where the o/p does not take any of the advice offered, do absolutely jack ■■■■, and go back for more, and just …carry on as normal. I hope not, but if he does? he asks for all he gets.