Basic Proposition:
Ohio Revised Code §1302.57. (UCC 2-513) Buyer's right to inspection of goods.
(A) Unless otherwise agreed and subject to division (C) of this section, where goods are tendered or delivered or identified to the contract for sale, the buyer has a right before payment or acceptance to inspect them at any reasonable place and time and in any reasonable manner. When the seller is required or authorized to send the goods to the buyer, the inspection may be after their arrival. (Emphasis Added. Additional subsections omitted.)
Ohio Official Comment to §1302.57. (UCC 2-513)
1. The buyer is entitled to inspect goods as provided in subsection (1) unless it has been otherwise agreed by the parties. . . . However, no agreement by the parties can displace the entire right of inspection except where the contract is simply for the sale of "this thing." Even in a sale of boxed goods "as is" inspection is a right of the buyer, since if the boxes prove to contain some other merchandise altogether the price can be recovered back; nor do the limitations of the provision on effect of acceptance apply in such a case.
2. The buyer's right of inspection is available to him upon . . . delivery . . . Since inspection is available to him on tender, where payment is due against delivery he may, unless otherwise agreed, make his inspection before payment of the price. It is also available to him after receipt of the goods and so may be postponed after receipt for a reasonable time. Failure to inspect before payment does not impair the right to inspect after receipt of the goods unless the case falls within subsection (4) on agreed and exclusive inspection provisions . . .
3. The buyer may exercise his right of inspection at any reasonable time or place and in any reasonable manner . . . The last sentence of subsection (1) makes it clear that the place of arrival of shipped goods is a reasonable place for their inspection.
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9. "Inspection" under this section has to do with the buyer's check-up on whether the seller's performance is in accordance with a contract previously made . . . (Emphasis Added)
There's a lot more to it, but its not a "done deal" (no returns) until the buyer has an opportunity to inspect goods after receipt. Even after a buyer expressly accepts the goods, there are circumstances that allow him to "revoke acceptance", return goods, and obtain a refund.