According to the links below about 10 % of https://en.wikipedia.org/wiki/Wagner_Group are Cargo-200 (in body sacks) after the attack.
About 200:
https://mbk.media/suzhet/razgrom-chvk-vagnera/
Girkin says it is about 644 https://donpress.com/news/11-02-2018-bolee-600-girkin-soobshchil-nastoyashchie-poteri-chvk-vagner-v-sirii
https://twitter.com/GirkinGirkin/status/962411040322605056
Cargo 200 refers to bodies contained in zinc-lined coffins, but in military context this code word can be used for dead bodies as they are transported from the battlefield.
Cargo 300 is the code for wounded soldiers
https://en.wikipedia.org/wiki/Cargo_200_(code_name)
Thanks AdmSmith.
The US has launched rare air strikes in eastern Syria to thwart and attack on allied Kurdish and Arab fighters aligned to Syria's government. Some 500 fighters had tried to take ground captured from the Islamic State (IS) group by the US-backed Syrian Democratic Forces (SDF)... Some US forces are embedded with the SDF but they suffered no casualties... The pro-government forces had been backed by artillery, tanks and other heavy weaponry when the attacked an SDF headquarters "eight kilometers (5 miles) east of the agreed-upon Euphrates River de-confliction line", US officials said...