Manifest more than 500 USPS orders on Xenvio

When doing an end of the day manifest for USPS (easypost) the maximum orders per manifest is 500 orders, when you are shipping over 3k USPS orders per day this means you have to manifest 6+ times and print out 6+ sheets to give to the driver who picks up. If there was a way to increase this maximum to 10k or so then it would be much easier for us and the driver who scans the sheets at pickup.