Netgear R6220 wall mount screws

I went with Handi-Pack Part# 86063 6 x 3/4 SLOTTED FLAT HD SHEET METAL SCREWS STAINLESS. These use a flathead instead of philips, but I had already made the holes and put in an anchor trying to use different screws before, so I just turned them in slowly with a hand screwdriver and now I've had the router up on the wall for a day or so without any major issues.

I sent someone else on the errand of trying out different screw sizes with a spare R6220 that wasn't currently being used for anything (I have several of these things), so I don't recall which store it's from. I'm gonna say it was either Home Depot or Menard's. The person I sent said this was all they found in the whole place that fit, and they only had one 2 pack of the screws there.

Note: I also see the number "89149" in marker on the back side of the bag the screws came in. I don't know why, but it might be important. Maybe the part no. was wrong on the bag or maybe that other part no. is similar.