What you need to show depends on the post or the day or the person.
Iguazu was particularly slack.
Theoretically you might be dealing with one person as is common at say Paso Sico so he will have your passport and then the TIP and if even slightly awake will notice the two documents don't match. Then he will ask for the Poder which should explain the discrepancy.... Even if the Immigration and aduana are separated, they often ask for passport and tip together. Wanting to see the title on the way out is uncommon but possible, especially if the officer is a bit suspicious.
Don't count on there being a "nomansland" because things can change overnight and combined border posts are becoming common.
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