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Just thought I would mention it.
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Ever since Steam Trades became its own site it has been neglected.
Which username? Steam usernames can be changed on whim and SG usernames can be changed as well after a time period. That's why it lists the SteamID64 number. If you use enhanced steam you can double check the SteamID64 on a steam profile page against the ST page, and if you use ESGST you can put button links to steam profile as well as SG profile under the green and red approval labels.
So it's not on there but there are fixes available to use.
no way to impersonate people with steamID64.
I know, it's annoying...