Wonder what the long delay was all about. OK, so you live overseas, but that shouldn't affect posting dates.
With regard to the capsule being wrapped in Scotch Tape, I find that inexplicable. I've had soft fabric round a coin, and that soft fabric wrapped in tape. But not the envelope or slab itself. As you rightly point out, you'd know immediately if the outer package had been tampered with, and the fact it was undamaged suggests the wrapping took place at LCA.