Please try to change the Last Order sync date in Channel Integration -> Config screen for that eBay channel. Please set that date to be prior the date when the oldest missing order was made on that channel -> save the changes and try to sync again. If you still do not get the orders in - please let me know some reference numbers and customer names I could check from my end for these orders.
The missing ordering miraculously appeared. i pressed the "unlock sync" button in application settings, but only because i'd logged into the website and it prompted me to do so. very strange, i've breathed a sigh of relief. what a nightmare on a monday morning!
thanks for the response