Running equo upgrade you might read at the end of the output
Calculando Actualizaciones del Sistema...
>> @@ Nada que actualizar.
>> @@ En el sistema hay paquetes que ya no están disponibles en los repositorios online.
>> @@ Even if they are usually harmless, it is suggested (after proper verification) to remove them.
These are the packages that should be MANUALLY removed:
>> ## [spm-db] perl-core/Perl-OSType-1.2 [209.1kB]
>> @@ Nada que eliminar.
>> @@ Configuration files scan complete.
user # equo remove Perl-OSType-1.2
user # equo upgrade
>> @@ Calculando Actualizaciones del Sistema... - calculating upgrades -
>> @@ Nada que actualizar. - Nothing to upgrade -
>> @@ Nada que eliminar. - Nothing to remove -
>> @@ Configuration files scan complete.
The command is equo remove name of the package, I suggest to put at the message an example with the first orphaned package - In this case my last one when I thougt in sending this post. Even better if there are a question prompting to remove them with a Yes/No.
