A former Dubrow's employee named Louis Adorno reached out via email, having stumbled upon this blog. He used to work at the Dubrow's in Manhattan in the 60's, where he says he "washed dishes I got lucky and got asked to work the counter." He recalled both Max Tobin and Paul Tobin. He says Max "would get mad when I ate the watermelon and took to many olives" and he recalled taking food to an apartment in Brooklyn after Max died.
Drop a line in the comments if you remember Louis!