Just call the person who sold it to you and request that they remove it from their iCloud account. You should then be able to restore it or clear it out.
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'''UPDATE'''
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Sorry I was not aware that it was an eBay buy. You did get five years of service out of it and it is pretty obsolete now. You can also get another working one on eBay now for under $35. https://www.ebay.com/itm/Apple-iPad-2-2nd-Generation-9-7-Replacement-LCD-Panel-A1395-A1396-A1397/263821325375?epid=1621856666&hash=item3d6cf9f43f:g:u6AAAOSwuehbThte:sc:FedExHomeDelivery!79423!US!-1
Just call the person who sold it to you and request that they remove it from their iCloud account. You should then be able to restore it or clear it out.