I have a character in my dm's campaign that has the boots of swiftness. I wanted to have them for another character, so I searched and didn't find it. I thought that I hadn't bought them, so I wrote: Boots of Swiftness in the Search Everything tab, but I didn't see them... I went on google to find them and it always brings me back to the Page not found thing, so my question is: Can I possess them or not?? I even tried to homebrew them, but the site said they looked too much like the real ones, which I can't find anywhere!! (Sorry for the poor english, French is my primary language)

It’s not “boots of swiftness,” it’s boots of speed that you are looking for.

No, they aren't the same, the boots of swiftness give a 10 ft bonus to your movement speed, the character is unaffected by difficult terrain and its speed can't be reduced nor can it be restrained by any magical ability or spell. I know this isn't homebrewed cause I searched it on the internet and came up with a result, but the result led to the error page....

This is a list of every official Magic item in 5e with the word “boots” in the name:

https://www.dndbeyond.com/magic-items?filter-type=0&filter-search=Boots&filter-requires-attunement=&filter-effect-type=&filter-effect-subtype=&filter-has-charges=

There is no official Magic item named “boots of swiftness” in 5e.

Yeah, just saw that it was an item from the League of Legends cross-over...... Well, I'll just have to make do with the boots of speed..... lame

Or homebrew your own.