wow Great feedback keep it coming 
WOW thanks for the feedback keep it coming.

Adding to what Bob said:
A one or two week trial period in which you are there from open to close, recording the sales yourself is also a must. Occasionally someone might want to see a deposit to show you are a real buyer before giving you that access, but mostly people will let you do that during the negotiation process. I've done that with every business I've been involved with. If they won't let you do it without good reason then walk.
WOW thanks for the feedback keep it coming.