If you use the eBay app, it is possible to "lock" the item location setting so that it only returns listings that claim to be located in the US. You may have to enable the lockable filters under customization in the filter menu first.
If you are using a desktop browser, there is a third party browser extension called "eBay Item Location -- My country only" that will allow you to override eBay's "default" item location setting when searching.
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