Apparently you are not concerned about accuracy in your records? I would NEVER purchase a dog from a breeder who left her in season bitch alone with two different intact male dogs, letting them breed at will basically. Either don't register the litter or send off for the DNA swab kits and go that route, otherwise you may very well be selling dogs with improper registration. Since you left her alone with an intact dog all night just because you did not *witness* any breedings, you left open a huge possibility that they occurred.
Why did you let your male tie with her twice in one day anyway? There is no reason to let them tie multiple times in a single day.