You can't trust what you read online DANZILLA93. The Mothra paperweight sounds like complete crap to me.
The first hint is that you can't find it. If it were confirmed to be in the movie, it'd be floating around like any of the other photos of Godzilla or the Mutos because everyone would be talking about it and referencing it saying "hey, here's one confirmed easter egg for all to see!" But since it's nowhere to be found, the chances of it being legit are pretty much zero.
The real easter eggs aren't going to be obvious. That's why they're easter eggs. When you watch the movie for the first time, you'll be lucky to spot even one of them since for the most part you'll be focused on Godzilla and the action going on. But hey, who knows, maybe some will be more obvious than others.