The only way for Avalon to prove that they have a legit product is to delay Batch #2 Orders until proof that their ASIC unit actually reaches Jeff and he can confirm the unit actually hashes on the network.
If Yifu anyways has to take a plane to get back to NY to oversee the batch #2 pre-orders, he can just take a unit in his suitcase and show it to a relevant person in NY (surely there must be somebody of 'statue' in NY?).