Hi Frank,
thanks, last question, which company make the delivery? and do they need you show you passport/ID for sign the correo, or they will just put the correo in the box. i have too many fear if lose the plastic
Delivered by post, Correo Argentino. We've had mixed experience with them, at one place we rented, simply out of laziness, the postman would falsely declare he'd been, rung the bell, and nobody answered. Where we are now, delivery of DNIs and passports has been absolutely correct. I believe a private postal company, OCA, is also used to deliver DNIs, but I don't have any experience of them.
You need to sign for the DNI on delivery. In fact, you also need the piece of paper they give you at RENAPER, to claim delivery. It's not going to just be dropped in the box. They don't show you the document, you get to open the envelope whenever you want yourself.
If the DNI can't be delivered after 2 attempts, at least in Buenos Aires it goes back to a central office in Av. Jujuy where it's kept until you pick it up. I've had a DNI kept for me there for over a year, due to the pandemic, I didn't bother to pick it up until I had renewed my temporary residency again and went to pick up the new one. They cut up the old DNI in front of me.
I'd say there's little chance of the plastic getting lost.