The UR5e and fitted adapter arrived. The additional adapter did not. Seller has marked the spare-kit line delivered using the arm's receipt, then promised it in the next shipment. Those two answers cannot both describe our stores shelf.
Have you sent the received count against the separate spare line, with the fitted adapter listed independently? I would ask them to correct that line before discussing their proposed shipment.
Will purchasing compare a properly identified alternative supply while that remains open? Waiting may be reasonable, but you need a costed option before deciding it is the only practical choice.