There have NEVER been any suitcase nukes. To assemble even a low yield weapon would require nearly 100lbs of shielding and fissionable material. A medium yield (50-100kt) weapon would be more on the order of two steamer trunks.
TV and movies show suitcase nukes in a Zero Halliburton case like this:
You might be able to squeeze enough fissionable material into this case but it would be unshielded and weigh 40 kilos.
“The W54 warhead used on the Davy Crockett weighed just 51 pounds and was the smallest and lightest fission bomb (implosion type) ever deployed by the United States, with a variable explosive yield of 0.01 kilotons (equivalent to 10 tons of TNT, or two to four times as powerful as the ammonium nitrate bomb which destroyed the Alfred P. Murrah federal building in Oklahoma City on April 19, 1995), or 0.02 kilotons-1 kiloton. A 58.6 pound variant?the B54?was used in the Special Atomic Demolition Munition (SADM), a nuclear land mine deployed in Europe, South Korea, Guam, and the United States from 1964-1989.”
Small nukes do exist, and the marketing folks can package them in many ways.
I think the actual “suitcase bombs” that the SU had were larger than footlockers.