Here is a blog post draft that turns this "error" into an engaging story. The 3,998 Mystery: What Happens When the Internet Glitches?

No context. No keyword. Just a four-digit number staring back at you.

Most of the time, seeing "(3998)" instead of your actual search term is a classic . Developers use "tokens" to tell a website where to display your text. If the connection drops at just the right microsecond, the site might display the internal ID of the search query rather than the word itself.