"I don't have anywhere to put them" becomes "I don't have where to put them".
This doesn't make sense to me but apparently, according to my girlfriend, is also correct.
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No, since "where" is typically used singularly ("Where did you go?" "He went where?") and "anywhere" is typically used in a plural sense ("I can't find it anywhere", "Just leave it anywhere"). If you have multiples but a definite location you would typically use "where." If you know I went to Europe, but wanted to know what countries I visited, you would still ask "Where did you go in Europe?" If you have no idea one way or the other about whether I took a trip at all, you would instead ask "Did you go anywhere this summer?" In that example, there is no definite location, while in the others there is.
There may be a slightly better way to phrase it, but that's about all I can squeeze out of my brain at the moment. Sorry if it's not precise enough.