Why is there an alert on my .box NFT?

If you have not read the article on WHOIS Information I suggest you start there.

.box Domains uses the NFT image as a means to communicate information to the user of that NFT. Currently the only user facing alert is the one for WHOIS info, however more may be implemented.

Token Does Not Exist (DNE)

If our NFT Image api service gets a request for a token which does not exist we return the basic NFT image template with a message saying the token information is not available.