In reply to Aban:
If you have to ask the question ….
I don’t want to slander the locals but Portland has two prisons. Its resident population is very insular and will not welcome mainlanders dumping their property in their back yard. Even parking legally but outside of a car park is likely to get you a stroppy letter on the windscreen. Not unfairly the locals hold the climbers to a set of rules so that they are not put upon.
you may see the cutting quarry as a mess with what a assume are manlander eyes but the locals have lived for generations in quarries and exposed limestone landscapes so I think you’ll find they value that landscape higher than you give them credit for.
and the path that you see as so remote is actually part of the costal party that thousands of people pass through. They value the landscape higher than you seem to.
so as it happens I suspect for stashed mat was probably just cleaned away. And if it was stolen then I think you only have yourself to blame. The quarry is not your backyard to do as you please with. It’s part of the heritage of Portland. It’s a much loved places by many locals and visitors and you should not be stashing anything there.