Thanks, got it. I was given a bit of conflicting info by DHL. One person there said to just present a permiso de importacion myself at some government department, but afterwards, I got the email with the agent's details. I had no idea I had to use a customs agent for this. The form was just asking for my name and address and the name of the agent I want to use. I've sent the form back so I'll see what's next. I'm probably being overly suspicious, but I hope it's all legit.