Sheriff's sale is not recorded

[Ryder Lee]

Hello, I won an online auction on a REO property in Philadelphia last year. I signed a contract with the seller last October (2015) and was told the property will be closed on 11/2015. Then I was told t that the property could not be closed because the foreclosure deed had not been recorded. So far I have extended the contract for two times and the deed still has not been recorded. The Sheriff sale was conducted on 8/2015, so more than 5 month has past. Does anybody know how long they can figure out the problem to get it recorded and what can I do to push the seller?

Thanks