That seems to be common for Si Cen. I was approved 12/28/22 and received my suppressors in the mail 02/10/23. Mostly, IMHO, they (SI Cen) have a customer service or customer expectation setting issue (beyond my belief that they are very very busy and likely understaffed for the volume based on their social media posts regarding approvals that come in). Growth is tough and hard to manage right, and I'm sure their business is booming. Heck, they even had to stop taking calls today for a snowstorm.
They promise all this quick delivery and whatnot, but would be better off to tell you the whole process upfront - including the delay in notifying the local law enforcement official they are shipping an NFA item to you and they wait a specific period of time after that letter is delivered versus their advertised let us do the work, get approved and the suppressor comes to your house. Then they have to transfer it to your in state dealer, then it gets mailed to you, which can take a few more days as well. Had i used the "kiosk" I would have picked the suppressor up much quicker
I'm not bashing Si Cen, but being told of this delay ahead of time versus becoming aware right after the elation of approval would be nice. I'll probably use them again (since they have all my stuff on file already) if I purchase from a dealer that doesn't do any of the paperwork online and just transfers to another dealer to handle that aspect of it.