Flipping REO

I am interested in flipping some REO to investors using a double closing. Do all realtors require a proof of funds letter or a credit pre-approval letter before submitting an offer? Have you got any suggestions on how I can deal with this (or get around it) if the subject comes up?

JW

usually, yes. In fact, in the listing itself, around here, most of them state just that. (proof of funds or pre-approval letter) is required. :S