I have sent some very expensive packages to them, I always use USPS Registered, it's slower but the safest way to ship and you can insure up to $25,000 with it.
I always forget ....registered you have to use the brown tape they told me..i always end up using the clear packing tape. but i always us DC and insure it well above its value. I had one shipment get lost to beckett and i learned the process quickly. the insurance barely covered the raw card cost.
also looking for 52 #311 A variation mantle
ROOKIE CARDS baseball & football.