Minor issue with transmission on 2000 Sportsman 500

I just brought home this 2000 Sportsman 500. As you can see from the picture, it has a little transmission problem. What can possibly cause something like this? Fortunately, it came with a new (used) transmission that I’m about to start swapping out. But it also came with a new case cover like the one you see damaged in the picture. Should I even bother trying to replace the case cover once I have it out, or has what caused those holes completely torn up the insides of the trans. It seems to shift through neutral, reverse, high and low from the shifter, but it’s been sitting for 1.5 years, so I haven’t run it yet due to bad gas, etc. to know if it actually can move. The bright side is, this thing is almost like new otherwise with only 1,000 miles on it. This must have happened fairly early in its life and they just let it sit. The guy I bought if from said the previous owner (original owner) started it for him when he bought it and it cranks over with good compression.

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Rear protection question

I am looking to buy this rear battery guard protector for my 2011 outlander xxc but can not find anything about it anywhere, can someone help me find part numbers or the actual name of it. I've tried all kinds of keywords on Google but no luck
Thanks !
And I'm new here but not to forums in general... can't figure out why I can't get pics to work


http://i67.tinypic.com/2v3nepd.jpg