[2banana]

The serial numbers on both guns had been filed off, they said.

Authorities found the receipt for the 9 millimeter handgun in his backpack

That seems to be illogical...

[gcruse]

The receipt could have been stuffed into the bottom of the backpack when he bought the weapon. Forgetting it was in there is reasonable.

[ctdonath2]

So is trying to off 60+ people for no good reason.

[SengirV]

I wouldn’t be looking for much logic here. The filing off of the serial numbers tells me that he thought of killing the ex with the intent of getting away with it. Between the filling off of the numbers and this spree, things obviously changed.

[wideawake]

Correct. It makes no sense that someone who legally purchased weapons and planned on dying while using them would file down the serial numbers.

Someone only does that if they want to sell them illegally to a third party and mask their provenance.

Filing them down could only create an added risk that he would be prevented from carrying out his evil plan - it wouldn't help him at all.

[Badeye]

The serial numbers on both guns had been filed off, they said.
Authorities found the receipt for the 9 millimeter handgun in his backpack

That seems to be illogical...

My reaction as well.