I shipped gear home (Australia) from France with French Post and it nearly made it home before I did. I've also shipped gear from Canada (where I landed) to Florida (where I was going diving after a couple of weeks of backpacking around South America). Flying without the gear was much easier in both cases.
Things to consider:
- Insurance in case the postal services loses the whole lot
- Dangerous goods. They might not want to ship knives, batteries, etc, and they might not tell you until you get there.
- Customs. Be clear on the goods description that this is your own excess baggage being shipped home, otherwise you might end up with 10% GST and 5% import duty applied at the Australian end.
- Quarantine. Make sure everything is clean and dry. If AQIS hold it up for inspection and washing, you won't get it back for six months or so.
- Timing. Make sure they don't put it on a boat, cause then you won't see it for 6 months or so.
- Packing. Mine was in heavy duty plastic tubs both times and traveled well.
Aside from that I have no idea what the postal options are in Ecuador. Good luck with it!