I agree with Uniserver. I'm looking over the posted pics and there is a lot of Bad to say about them.
Like Uniserver pointed out, the 3rd SIMM (next to the burnt one) was its cap in its wrong location. But also, look at the traces under it as well, it looks like to me there is spilt solder they tried to clean up and did a bad job in removing the spilt solder, creating shorts. Also on that one and the burnt one, it looks like there is a cold solder joints in chips at the bottom of the SIMMs. And the Labels hang over the edge of the chips! That's the job of a rank amateur right there! I would send them back with an email saying "Thank you for wrecking my machine!" Make sure Amazon gets a copy of that email!
Anyone can get those sliver bags and a sealer, hell, you can get them on ebay for almost nothing! Though a lot of them are closing down in NYC, I seen "Chinese Tech Firms" have a young guy in the back and his job is going through a mound of SIMMs, matching them, and running them through a SIMM tester before putting a label on them and putting them and sealing them in a silver anti-static bag before it goes onto a shelf for sale.
You're lucky that it did not hurt your SE\30. Very lucky.