No, the 'placeatme' command spawns a copy. Not the one you've been using. You
won't get your stuff back.
Have you upgraded him yet? There's 3 Ref ID's for him, depending on if he's upgraded, which one you chose or if he isn't.
To get your stuff back, even though it may not bring him back, type this:
prid 1732d1openteammatecontainer1732d1 is his default ID.
1732D0 weapon upgrade
1732CF armor upgrade
If you've upgraded him use one of the those other ID's with PRID.
Edit: You may also be able to set him to not waiting, then he may catch up when you next fast-travel or go through a load door. I haven't done it with vanilla followers, just my custom ones, but if you want him to catch up again, it'd be
prid RefID [Enter]
set waiting to 0. NV followers seem to have pretty much the same basic scripting as FO3 followers.
If it doesn't work at least you have your stuff back from the previous commands