From first picture, it looks like it has beaded tubercles, if this is true, I would speculate it was:
this taken from my Anemone Bible, Marine Atlas Vol.1
Heteractus Aurora or commonly called Beaded Anemone.
Lives singly in rock crevices or reef terraces or on sand. It is host to numerous clownfishes
Requires 20cm of sand with hard substrate underneath to ancor itself to. It is weakly adhesive. Totally retreats into substrate when disturbed.
feed: mussel, fish, and crustacean meat
It is extremely polynmorphic and has been described under wide variety of names. The upper part of it's body is grey to chestnut brown, depending on the density of the symbiotic zooxanthelae, while the interior half of the body is golden yellow. Body has a column of rows of light suction tubercles, smallest along the top. Special characteristics are the white elivated spots on the tenacles, they can be single or designed, Larger white spots foprm raised areas if these encircle the tenacles, thick and thin segments alternate.
Does this seem like your anenome?