It may be too late for this to help, but as with most contractual time constraints the time allowed for deposit and for full payment are 24 and 72 hours in business days, Saturdays and sundays not included. Ebay also has a policy in which no matter the time frame the buyer has three business days in which to make contact with the seller after auction end. That widens the allowed time frame considerably. Hopefully it is not to late for this to be of assistence. I have a relative whom works with Ebay I could put you in contact with if it may help. PM me.
L78 Elcamino