Thanks, you were way more helpful than eBay support. Indeed, eBay
removed some field validation recently (maybe as part of rolling out
Business Policies) where it no longer requires 'Package dimensions' to
create a listing. Further, eBay Standard Env...
They have changed the policy or something this week (whether by mistake
or purposeful, I don't know). You can now choose the eBay Standard
Envelope cost and send it to the buyer via invoice. The buyer sees a
"shipping issue" until you do.