Did NASA delete Black Knight Satellite from its photo archive?

There is uncertainty created if NASA deleted UFO photo's from its photo archive.

The UFO photos first appeared on the NASA Johnson Space Center website in May 2011 and clearly showed spacecraft of some advanced design.

The photos were uploaded and stayed on the NASA website for over a year and half until being recently removed.

But now it becomes clear that NASA JSC moved their digital images to different locations.

Also the Black Knight Satellite link is found again.