Checksup fail despite correct value

[bristol-d]

Trying to download a vagrant box:

vagrant box add zenshade/mint64-xfce-20

Gets me this error:

==> box: Loading metadata for box 'zenshade/mint64-xfce-20'
box: URL: https://vagrantcloud.com/api/v2/vagrant/zenshade/mint64-xfce-20
==> box: Adding box 'zenshade/mint64-xfce-20' (v1.0.0) for provider: virtualbox
box: Downloading: https://vagrantcloud.com/zenshade/boxes/mint64-xfce-20/versions/1.0.0/providers/virtualbox/unknown/vagrant.box
box:
box: Calculating and comparing box checksum...
The checksum of the downloaded box did not match the expected
value. Please verify that you have the proper URL setup and that
you're downloading the proper file.

Expected: 5cdefeacdd0259ea666f1112211af306  package.box
Received: 5cdefeacdd0259ea666f1112211af306

I'm not sure what's happening here, but those two hash values are the same.

If it helps,

vagrant --version
Vagrant 2.4.1

Both vagrant and virtualbox freshly installed on a Win10/intel i7-8700 machine.