i only paid for box upon ebay ( http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=390010119702 ) , as well as it doesnt strengthen a screen. will this shade guardian ( http://cgi.ebay.com/LCD-DISPLAY-SCREEN-PROTECTOR-for-iPod-iTouch-Touch_W0QQitemZ260323428355QQcmdZViewItemQQptZOther_MP3_Player_Accessories?hash=item260323428355&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318 ) let me still make use of a ipod touch, or will a shade not reply whilst a box is on? please, greatfully assistance me.
will it slip off a ipod?

First of all, you don’t need a screen protector for the touch because the screen is unscratchable. Anyway, back to your question… No, it will be fine.
Yeah it will work and yes you do need one the screen is not indestructable it can get cracked or scratched