This used to be called "gray market" (grey?) items. Items that are imported not through official channels (for example camera lenses that are often for sale from the bigger dealers in NYC).

There is no warranty, but the lenses are cheaper (due to currency values and the price the companies set it can be a little cheaper, but sometimes a lot cheaper). In the old days the prices in magazines for equipment where in 2 columns, US and imp (imported by us).

In your case you bought the computer overseas an brought it in yourself.

For example Nikon doesn't want you buying gray market and set up a page to try to deter people: https://www.nikonusa.com/en/nikon-store/gray-market.page

Some places that sell gray market lenses will cover the warranty for you in place of the manufacturer (probably a good bet, the if the items are well made and they have an in house repair)

https://www.photo.net/discuss/threads/would-you-buy-gray-mar...