Stealing Houses!?!?

[Geno]

i had my house frame up with a few stones in it and i returned 4 days later to find out it is the comleated house of someone else!!
is there some way to claim the unfinished house of someone else?
(when you rightclick the house it says his accountname, when you rightclick the mailbox it says mya ccount name, yet i can't accsess the mailbox for taht involves the house key....bastard!)