I remember during the AWB'94 it was so bad that the manufacturers would run promotions where they would ship guns from the factory with one 10 rnd mag but include a coupon you could send in with a copy of your receipt, bar code and warranty card to get a free "hi-cap".
Personally, I saw it more recently when I purchased a Colt 6920 from Wal-Mart and the entire swag bag had been snatched and replaced with one Thermold brand magazine loose in the box
I got a big "fuck-off" from both Colt and Walmart. Apparently the distributor in the middle stole everything.
and yes, it was stolen because the gun is cataloged by Colt as coming with certain accessories and Wal-Mart made no disclaimer that the gun comes with nothing but a cheap after-market mag that won't function.