Commands for testing presence of packages seadata-small, seadata-big, nftables?

[Matthias Koeppe <mkoeppe@ucdavis.edu>]

The page https://pari.math.u-bordeaux.fr/packages.html lists helpful
commands for testing the presence of several of the data packages.
Is someone able to provide such commands for the packages
seadata-small, seadata-big, and nftables?

Thanks
Matthias
-- 
Matthias Koeppe -- http://www.math.ucdavis.edu/~mkoeppe