All shipments from Rhino Seeds are trackable & require a signature upon delivery for your protection and ours, but some countries do not enforce the signature requirement.
If you ship to a UK address, you will have to sign for your seeds.
If you ship to a US address, you will have to sign if your tracking number starts with an R indicating that the shipment is registered. Otherwise, you will probably not have to sign.
Please see Royal Mail's current coverage details to find out if your country's postal service collects signatures for Royal Mail.