Stranger sent a gift not from registery

A stranger had a gift from Amazon mailed to our home. The gift receipt read, "Found you all in a Tik Tok comment. Congratulations!" They did sign their first name.

However, we do not have a tik tok. The item purchased was also not from our Amazon registry, so they must have had our address.

Idk if this is sweet or if I should be freaking out. I'm a worried about how they got our information.

Any ideas? I have already asked family and nobody knows anything 😕