FX New FX liner with a surprise inside

Received a new liner today. After I got done doing what I had to do I decided to clean it before the install. Couldn’t push my chord through it so I had to use a rod. Look what was inside. Anyone else experience this?

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I would not be surprised if FX is testing the liners, I believe at least for a past one year.
I got two liners from two different sources, one .22x600 STX-A slug liner (1:15.5) and one .25x600 Superior (1:24) about several months ago and the indexing mark was on both liners. I sent an email back to one dealer if it was a return and he didn't know anything about it and assured me it was a brand new unpacked, so assume these marks not coming from a dealer.