Can 12 months of paid receipts for rent be sufficient for an FHA loan?
Receipts will not work. You need 12 months of cancelled checks or bank statements evidencing the rental history. The way the underwriter sees receipts is that anyone can make out a receipt so it's not a solid form of proof. If you pay a property management company the lender can obtain an...

If I move into the house I just bought, but there is a delay from the seller's side, can I move in before?
Sometimes the seller is willing to allow you to move in and RENT before the close of the sale. This is not common practice and is risky on the seller's side.