thx.
Hell no! If you do load you will be taking a chance someone has copy of private keys.
But if you load with $10 or $20 worth of crypto and can live with the fact there is a possibility you can lose your coins...then load away.
The days of trusting someone like bitbills and casascius with anything near 1BTC or over 0.001BTC are over for me...unless I really know and trust them thru forum.
How can you lose your coins? As long as the marks are unused (not rubbed), nobody can access the ETH address?
There is always a chance someone who made the stamps to have a copy of all the private keys issued. And as long as that chance exists...its a risk.
If you are not the one making the paper wallet, then you can never be sure who else has copies of the private keys.
You can read about such issues and scammers here>> https://bitcointalksearch.org/topic/info-breached-or-scam-coin-makers-list-3315347