I've looked into `steem_cli` RPC call `get_account_history`, and this is what I get from executing an order:

1.) Placing an order
```
======> limit_order_create
{'amount_to_sell': '8.700 SBD',
 'expiration': '1969-12-31T23:59:59',
 'fill_or_kill': False,
 'min_to_receive': '3.000 STEEM',
 'orderid': 1469778670,
 'owner': 'furion'}
```
.
2.) Order being filled (it was not filled at once, hence the two separate fills):
```
======> fill_order
{'current_orderid': 162741016,
 'current_owner': 'enki',
 'current_pays': '2.141 STEEM',
 'open_orderid': 1469778670,
 'open_owner': 'furion',
 'open_pays': '6.208 SBD'}

======> fill_order
{'current_orderid': 951953610,
 'current_owner': 'enki',
 'current_pays': '0.859 STEEM',
 'open_orderid': 1469778670,
 'open_owner': 'furion',
 'open_pays': '2.492 SBD'}
```

Thank you @theoretical for pointing this out. I've learned so much today :)