You paid Arken. Arken contracted delivery services with UPS. UPS never delivered and has no evidence of delivery, so Arken is soley responsible for making a claim with UPS. Basic contract law, Article 2 of the Uniform Commercial Code.
Solution: Most retailers are lazy, so just file a dispute directly with your credit card and make Arken figure it out with the credit card. Meanwhile, order another scope using the discount. Should the first package eventually be delivered, simply return it under dispute.
*Had the package actually been delivered to you but damaged or missing items, Arken is still responsible for the claim but you are required to participate in the investigation since you are in possession of the package.
Solution: Most retailers are lazy, so just file a dispute directly with your credit card and make Arken figure it out with the credit card. Meanwhile, order another scope using the discount. Should the first package eventually be delivered, simply return it under dispute.
*Had the package actually been delivered to you but damaged or missing items, Arken is still responsible for the claim but you are required to participate in the investigation since you are in possession of the package.