ip's are used over and over by many different ppl
if i use an ip that i used 2 months ago on a diff eb ay account that is not gonna do me any harm if my accounts are different and there is no similarities etc
that same ip will of been used on eb ay probably a few times before it came back to me
but,if you want to be super stealth and it's no hassle to change the ip address then don't ever re-use
i only do it as it takes a life time to change and then some more,really pi55es me off 
sometimes i have spent an hour,no lie,turning it on and off and checking if it changed
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