Ok I have read this several times now and since you asked?
Should you have know there was a meter socket or even might be one hidden in the sealed section?
If the answer is yes then pony up and buy the lesson.
If the answer is no, take your case to the GC and either ask them to split it with you or take their case to the owner and explain it was an unforeseen condition. Be upfront and honest and hope they don?t think you are scamming them. Maybe some documentation from the POCO about sealed units would be good too.
My experience has been, you lose some, and you win some and if you were working in this gear and had a permit, you should have already cut open the sealed section and been ready?or at least as an owner that is how I might see it.
Take the loss, learn the lesson, move on.