Check if offer is being processed by steam

[apibot]

So, my bot cancels trade-offers after 30 minutes(now set to two hours).

How do I check if the trade is already being accepted but not fully processed yet(for large trades like buying sets of cards).

Yesterday, my bot cancelled a trade that was already accepted but not marked as accepted yet bc it consists atleast 300 or more cards and it usually takes a few minutes to process. It ended with some of my cards missing and my client's keys are missing too. I checked my bot's inventory history(not trade history) and it showed that some of the cards were traded, just traded without a name to whom it was traded to. 

Possible workaround is to remove automatic cancellation of trades