Shocks/shock bush top hats/reducers are held in place by clamping force provided by the bold and not by the bolt itself (i.e. not the shear resistance of the bolt, except possibly on bottom out) which is why you are not meant to grease any part of the bush or pin (you can grease or loctite the threads if you wish).
So it looks like they had just forgotten to tighten up the bolt, you/it will be fine if the play is now irradiated.