I post here, and see whether someone could give me a hint.

I try to retrieve a GSE record (GSE13284) using the GEOmetadb, but for some reason it didn't return anything.

rs <- dbGetQuery(con, paste("select * ", "from gsm", "where series_id='GSE13284'" ))

FWIW, I was able to find the matrix file (below), so it seems that the information is there.

https://ftp.ncbi.nlm.nih.gov/geo/series/GSE13nnn/GSE13284/matrix/

Thanks.