COMC: Identifying cards not purchased in simplified shipping mode

[CollectTheU]

COMC no longer offers phone or email support (2 weeks of emails have gone unanswered) so I'm hoping a more experienced user can help me. I wanted to get my COMC cards shipped to me but, instead of the usual $4.99 flat shipping, I'm getting a range of price options from $14.94 to $894.94. It says I do not qualify for Flat Rate shipping because "One or more of the items in your shipment were not purchased on COMC.com from Simplified Shipping Mode and still has a per-item shipping fee due." Is there a way to use the Inventory Manager to identifiy which cards were not purchased in Simplified Shipping Mode so that I can omit them from my shipment and pay the usual $4.95? Thanks for any help you can provide.