net ball pokemon card | Pokémon Wiki Originally released February 3 Poké Ball (PROMO-A #5/92, Promo)

More of the cards original gloss may have worn away

You can do this at any point after the creature has been declared as an attacker so anytime from the declare attackers step through the end of your turn

Card not found, on the other hand, is the basis for a deck in Modern (its namesake actually) and played in Legacy Storm decks (maybe Vintage as well, I dont know the format enough to say)

Most modern fakes are able to get the weight about right, and in cases where the card is notably lighter than the real deal, you'll almost certainly already have been able to spot the card as a fake via other means, like quality and feel of the material - making weighing a bit surplus to requirements