What crypto do you accept in your project?
I don't recommend you to invest in this project until they tell what are they going to do with the unsold tokens!
I recommend that you should only invest in project that you are confident with, know the team well, know their projects well, due diligence, what any team going do with unsold tokens should not be one's priority in making investment decision!
Also, STASH unsold tokens is stated in white paper, quote from CAVA
as it is clearly outlined on the stashpay website any tokens not sold during the sale will be allocated to the Company and will be sent to the STASH Vault and locked until 27-09-2018.