Stuck on Curator Aspiration

[Juno Beach]

I need to complete a collection but I'm short one item in four categories and it's really frustrating trying to complete it. Any tips would be appreciated.
I need one uncommon MySim, fossil, and space rock and a rare metal. 
Is collecting postcards or frogs (need a bunch of them) easier?

[jillz]

Postcards is easier but it takes a long time. Frogs you have to unlock certain breeds by breeding them, there's probably a guide out there you can use. I've just randomly bred frogs together for now.

[Juno Beach]

I'm missing about four frogs. Guess I'll search for a guide, thanks.

[saltpastillen]

I'm missing about four frogs. Guess I'll search for a guide, thanks.

Don't forget you can breed them to get some rare ones.

[Juno Beach]

Yeah, I've lucked into breeding some new ones but it's hit or miss.

[Joria]

When you started your curator did he/she have a very small area in which to search for things to begin with?  Mine had less than a block rather than her entire neighborhood, while my gardener Sim can go everywhere.

[Juno Beach]

When you started your curator did he/she have a very small area in which to search for things to begin with?  Mine had less than a block rather than her entire neighborhood, while my gardener Sim can go everywhere.

No, she can travel anywhere to look for stuff.

[Playalot]

I've found all the space rocks by using a rocket to go into space, and the fossils and metals just by luck on a dig site. Same with all the My Sims little statue things. I don't know if there's a trick to it or if it's just a random chance thing. Sometimes using a treasure map brings in rare items but other times just simply using the dig option.

I've had to go to both the hidden locations though to find items.

*edit* this thread might help you...   http://www.carls-sims-4-guide.com/forum/index.php/topic,21031.0.html

[Juno Beach]

This is getting ridiculous. Now I need one frog, one fossil, one postcard, one space rock, one MySim, one space print and one metal. I still have no complete collection. Every time I get a space rock it's either the common (6 and counting) or the rare (3). Because of the plant glitch I can't collect all the plants. Time to go fishing. Arrgghh.

[Juno Beach]

My final postcard arrived! Finally a complete set. Whew!

[Brotte]

Here's a pretty good guide to frog breeding:

http://www.carls-sims-4-guide.com/forum/index.php/topic,21203.0.html