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Anthribidae, cocoon - Trigonorhinus limbatus

Anthribidae, cocoon - Trigonorhinus limbatus
Plymouth Rock, Winneshiek County, Iowa, USA
December 29, 2017
Size: 5 mm
In a planted prairie, cocoon in/on Sneezeweed, Helenium autumnale. This photo shows the side of the cocoon that is the outer surface of the receptacle with the bases of the flowers. (Please, if a botanist reading this can put the description in proper terminology, please do.)

Trigonorhinus limbatus
BG info says: “T. l. limbatus feeds on pollen of various composites, especially Helenium (sneezeweed), Coreopsis, and some similar daisy-like flowers, and the larvae bore in the flower receptacle and stem. (Barry Valentine, pers. comm.)”

I may be assuming too much but…
perhaps I can tie some BG postings together even if it was somewhat of a Catch 22.
It's difficult (for me) to tell a cocoon found in Sneezeweed, Helenium autumnale from a wad of plant debris as they look very similar. I ended up squishing more than one larva in an attempt to determine if the wad of debris was indeed a cocoon. So I put what might have been cocoons or perhaps just wads of debris into rearing jars. One cocoon/wad was photographed and given its own vial. As luck would have it, an adult emerged so it was indeed a cocoon.

December 29, 2017: opened cocoon

Perhaps from a larva such as this:

May 11, 2018: (on or before) an adult anthribid emerged from this cocoon
I had hoped to get more than one adult but am thrilled to have gotten one.

Is there enough information here to confirm the beetle ID?
ID based in part on this post:

Is there enough information here to tie the larva to the adult?

Images of this individual: tag all
Anthribidae, cocoon - Trigonorhinus limbatus Anthribidae, other side of cocoon - Trigonorhinus limbatus Anthribidae, frontal - Trigonorhinus limbatus Anthribidae, dorsal - Trigonorhinus limbatus Anthribidae, lateral - Trigonorhinus limbatus Anthribidae, ventral - Trigonorhinus limbatus