I went up a small hill behind the offices at the point of entry (a right turn heading into Paraguay), into a two story building full of offices. Finding the right guy involved some asking around, and he was in an office upstairs and to the right. If I were you, I'd try again but ask non-officials (police, taxi drivers, etc.) for the aduana offices.
There was construction underway when I was there, so probably it's all different now. Good luck.
Mark
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