First consideration is that DJI will not repair it in the USA. All maintenance must be performed in the country of sale… Reason is that DJI certifies that drones sold in the country will meet all regulatory rules and laws. Since there may be Firmware difference between US and European drones, DJI will not risk changing out a part that might violate the local laws…
Next you and he need to decide how he will pass it through US Customs… Will he try to get it through customs as a gift for his BIL (you) or try to pretend it is his personal drone…
If he tries to pass it off as a gift for his BIL (you…), customs might consider it an import and subject to all import tariffs and since it is a "CHINESE DRONE" it just might be seized if they think your BIL is importing it…
Or he could try to pass it off as his personal drone, and it probably should be "somewhat used…" and for him to fly a drone in the US, tourists must register their drone with the FAA and take The Recreational UAS Safety Test (TRUST) for recreational flights. Drones weighing over 250 grams must also have Remote ID capability, and foreigners must submit a Notice of Identification (NOI) and carry the resulting Confirmation of Identification (CID).
So, I would advise you and your BIL to research this… I guess it is a lot to consider, do you try to get it through customs as a gift for his BIL (you) or try to pretend it is his personal drone…
As for me, my son is working a big electrical contract in Saginaw, Michigan, and that is only a short drive into Canada, but I would not ask him to try to go get me one at this divisive Chinese Drone time…