The nearest thing, possibly, encompassing "mistrust" & "gifts" would be the well-known: "timeo Danaos et dona ferentes" = "I fear the Greeks, even when bearing gifts."
(Virgil, "Aeneid" 2.49)
Surprised that no-one offered this, at the time; unless, in some way, it's completely wrong?
The Romans claimed to admire the Greeks; but, really, they despised them. They, the Romans, felt culturally inferior. It is possible to imagine a Roman sneering at something he distrusted as a "Greek gift". Cannot offer evidence; apart from, tenuously "I Claudius" & "Claudius the God" by Robert Graves (if yourself has not read these, you've just got to) which show the thinly-disguised realities. Exemplified in the "I Claudius" TV-series (1976): Claudius, disparagingly, to his Doctor, Xenephon, "Don't you Greeks believe in anything?"; loathesome, "Lady" Agripinilla advises her equally loathesome son, Nero: "That Greek (Pallas) runs This Empire!" This, after Nero had said: "I don't like that Greek."
Robert Graves always said that the spirit of Claudius wrote the books through himself (Graves). Yeah, right; but, what a marketing strategy. Given the intricate detail; depth of knowledge; the powerful pro-Claudius narrative (statesman; war-leader; historian; lawyer; judge; administrator; merciful; gentle-but-effective commander) to say nothing of incredible biographical revelations about "sweet, young Emperor Caius"...Who knows?
"I Claudius" was one of the best things I have ever seen on TV-- well-worth it.