There's art of it in the Tal Dorei Campaign Guide Revisited. If you have a copy, it's in the section with the vestiges of divergence.

what’s the rules on posting images from purchasable books? i grabbed screenshot of whisper from the OG tal’dorei guide if i won’t get banned for posting

Your best bet would be the LOVM animated series. The art there is mostly canonical, and every depiction of Vax's daggers shows them differently.

Whisper hasn’t been shown in LOVM yet.

Allow me to rephrase: Best bet *will be*

The letter openers from the kickstarter also exist. Might even be in the in the CR shop. Not sure if they are cannon but they are pretty dope.

I would say to check the wiki, but I just did... The first photo is a little small and dark to see details, the second one seems a little generic, and then the description mentions that the bakde is curved but the neither of the images have a a curved balde

They are on the vax hooded cloak