you are real close on this one since the old rule of thumb was only 3 days for cooked meat under refrigeration after that freezing was required. the best advice that i could offer is (since you customer is traveling and can't get the food after wednesday) as soon as your ribs are done chill them as fast as you can to below 41 degrees. then i would simply wrap the chilled ribs in film and then wrap that in heavy gauge foil. i would advise my customer to keep them chilled in an ice chest until his refrig was at operating temperature.
to reheat you have a couple of choices leave the foil on and reheat in a 350 degree oven as this will act as a steam chamber with the film still on under the foil.
or you could individually heat them in a microwave with only the film left on for maybe 2 or 3 mins.
main thing is chill them as fast as you can,wrap each slab individually and warn the customer they must be kept at all times under 41 degrees until they are reheated.
hope this helps,
jack
ps. are you sure there is no way your customer can take delievery on thursday or even friday? that would give you a safety margin