That kind of makes sense I can provide all sorts of prof of packing and tacking number and we can track the same via ups or dhl. I will let you know if I am able to sell some stuff I will advise to the buyer to use escrow through you that way we will both be secure.
I escrowed for physical items. I let both parties know that the item must be shipped with a tracking method that I can access (FedEx, UPS, DHL, etc.).
Both parties must agree before hand that a successful delivery as shown on the tracking website constitutes fulfillment from the seller.
I have escrowed other physical items with more requirements, but each thing that I have to check will increase my escrow fee.
Things like: check for signature and holding funds until a certain date.